img{
    display: block;
    width: 400px;
    height: 400px;
    margin: auto;
}
.aa{
    position: relative;
    width: 401px;
    height: 401px;
    margin: auto;
}
.a1{
    width: 50px;
    height: 50px;
    background-color: cadetblue;
    border-radius: 50%;
    position: absolute;
    top: 40%;
    line-height: 50px;
    text-align: center;
    left: -50px;
  
   
}
.a2{
    width: 50px;
    height: 50px;
    background-color: cadetblue;
    border-radius: 50%;
    position: absolute;
    top: 40%;
    right: -50px;
    line-height: 50px;
    text-align: center;
}